please dont rip this site Prev Next

MEMORY_BASIC_INFORMATION info  Overview  Group

The MEMORY_BASIC_INFORMATION structure contains information about a range of pages in the virtual address space of a process. The VirtualQuery and VirtualQueryEx functions use this structure.

typedef struct _MEMORY_BASIC_INFORMATION { // mbi 

    PVOID BaseAddress;            // base address of region 

    PVOID AllocationBase;         // allocation base address 

    DWORD AllocationProtect;      // initial access protection 

    DWORD RegionSize;             // size, in bytes, of region 

    DWORD State;                  // committed, reserved, free 

    DWORD Protect;                // current access protection 

    DWORD Type;                   // type of pages 

} MEMORY_BASIC_INFORMATION; 

typedef MEMORY_BASIC_INFORMATION *PMEMORY_BASIC_INFORMATION; 

 

Members

BaseAddress
Points to the base address of the region of pages.
AllocationBase
Points to the base address of a range of pages allocated by the VirtualAlloc function. The page pointed to by the BaseAddress member is contained within this allocation range.
AllocationProtect
Specifies the access protection given when the region was initially allocated. One of the following flags can be present, along with the PAGE_GUARD and PAGE_NOCACHE protection modifier flags:

Flag

Meaning

PAGE_READONLY

Enables read access to the committed region of pages. An attempt to write to the committed region results in an access violation. If the system differentiates between read-only access and execute access, an attempt to execute code in the committed region results in an access violation.

PAGE_READWRITE

Enables both read and write access to the committed region of pages.

PAGE_WRITECOPY

Gives copy-on-write access to the committed region of pages.

PAGE_EXECUTE

Enables execute access to the committed region of pages. An attempt to read or write to the committed region results in an access violation.

PAGE_EXECUTE_READ

Enables execute and read access to the committed region of pages. An attempt to write to the committed region results in an access violation.

PAGE_EXECUTE_READWRITE

Enables execute, read, and write access to the committed region of pages.

PAGE_EXECUTE_WRITECOPY

Enables execute, read, and write access to the committed region of pages. The pages are shared read-on-write and copy-on-write.

PAGE_GUARD

Protects the page with the underlying page protection. However, access to the region causes a “guard page entered” condition to be raised in the subject process. This flag is a page protection modifier, only valid when used with one of the page protections other than PAGE_NOACCESS.

PAGE_NOACCESS

Disables all access to the committed region of pages. An attempt to read from, write to, or execute in the committed region results in an access violation exception, called a general protection (GP) fault.

PAGE_NOCACHE

Allows no caching of the committed regions of pages. The hardware attributes for the physical memory should be set to no cache. This is not recommended for general usage. It is useful for device drivers; for example, mapping a video frame buffer with no caching. This flag is a page protection modifier, only valid when used with one of the page protections other than PAGE_NOACCESS.

RegionSize
Specifies the size, in bytes, of the region beginning at the base address in which all pages have identical attributes.
State
Specifies the state of the pages in the region. One of the following states is indicated:

State

Meaning

MEM_COMMIT

Indicates committed pages for which physical storage has been allocated, either in memory or in the paging file on disk.

MEM_FREE

Indicates free pages not accessible to the calling process and available to be allocated. For free pages, the information in the AllocationBase, AllocationProtect, Protect, and Type members is undefined.

MEM_RESERVE

Indicates reserved pages where a range of the process’s virtual address space is reserved without allocating any physical storage. For reserved pages, the information in the Protect member is undefined.

Protect
Specifies the access protection of the pages in the region. One of the flags listed for the AllocationProtect member is specified.
Type
Specifies the type of pages in the region. The following types are defined:

Type

Meaning

MEM_IMAGE

Indicates that the memory pages within the region are mapped into the view of an image section.

MEM_MAPPED

Indicates that the memory pages within the region are mapped into the view of a section.

MEM_PRIVATE

Indicates that the memory pages within the region are private (not shared by other processes).

See Also

VirtualAlloc, VirtualQuery, VirtualQueryEx 


file: /Techref/os/win/api/win32/struc/src/str10_25.htm, 8KB, , updated: 2000/4/7 12:20, local time: 2022/5/27 05:56,
TOP NEW HELP FIND: 
100.24.115.215:LOG IN

 ©2022 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF="http://www.piclist.com/techref/os/win/api/win32/struc/src/str10_25.htm"> MEMORY_BASIC_INFORMATION</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.


Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

  PICList 2022 contributors:
o List host: MIT, Site host massmind.org, Top posters @20220527
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.
 

Welcome to www.piclist.com!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .